ST tires are made with a compound that doesn't dry out as fast when it's sitting, and the sidewalls may be a little stiffer.

As long as the tire has a load rating high enough for the load, meets minimum tread depth, and is properly inflated, with no cords exposed, what can they say?

There are all kinds of semi trailers running around with under-spec steer tires (tires on a steer axle have a deeper minimum tread depth than drive or trailer tires per DOT), drive tires that lost their mates, and recapped steer and drive tires out there. Are they going to take all those out of service? I don't think so.

They guys I know that used to mix compound for Uniroyal disagree with you. The "trailer tire mix" was the left overs from all the other batches run. Think of trailer tire compound as analogous to pot metal. Anything left over was just tossed in. They ran trailer tires when the scraps piles started to overflow. I can't imagine that the products from China are better or produced differently than what Uniroyal used to make. Could be wrong, but...

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